utcTime Z后边有很多非法字符，解析竟然完全没有错误，是为什么呢？

   public static void main(String[] args) throws ParseException {
        String utcTime = "2018-01-31T14:32:19Zsdfsdfsssss";
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
//设置时区UTC
        df.setTimeZone(TimeZone.getTimeZone("UTC"));
//格式化，转当地时区时间
        Date after = df.parse(utcTime);
        System.out.println(after);
    }

   /**
     * 本地时间转 UTC 时间字符串
     *
     * @param date
     * @return
     */
    public static String localToUtcString(Date date, String pattern) {
        SimpleDateFormat sdf = getSdf(pattern);
        sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
        return sdf.format(date);
    }

    /**
     * UTC 时间反格式化
     *
     * @param date
     * @param pattern
     * @return
     */
    public static Date utcStringToUtcDate(String date, String pattern) {
        SimpleDateFormat sdf = getSdf(pattern);
        sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
        Date utcDate = null;
        try {
            utcDate = sdf.parse(date);
        } catch (Exception e) {

        }
        return utcDate;
    }

    /**
     * UTC 时间格式化
     *
     * @param date
     * @return
     */
    public static String utcDateToUtcString(Date date) {
        SimpleDateFormat sdf = getSdf("yyyy-MM-dd'T'HH:mm:ss'Z'");
        sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
        return sdf.format(date);
    }


    /**
     * UTC 时间字符串转本地时间
     *
     * @param date
     * @param pattern
     * @return
     */
    public static Date utcStringToLocalDate(String date, String pattern) {
        SimpleDateFormat sdf = getSdf(pattern);
        sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
        Date localDate = null;
        try {
            localDate = sdf.parse(date);
        } catch (Exception e) {

        }
        return localDate;
    }

时间格式化及完整类
https://blog.csdn.net/Lxinccode/article/details/79414292